We found this passive circuit in the February 1995 Electronics Now magazine. The circuit is passive, presenting only attenuation that must be compensated by an amplification stage.
This 300 Hz to 3.4 kHz filter was found in the May 1989 Radio Electronics magazine. The circuit...
This circuit used in signaling for boats, cars or barriers was found in a 1980s documentation. It still...
This circuit was found in a NASA documentation from the 1980s. Component values are application...